{"id":1257,"date":"2026-10-02T14:23:38","date_gmt":"2026-10-02T05:23:38","guid":{"rendered":"https:\/\/www.risu-japan.com\/drill\/?p=1257"},"modified":"2026-10-02T14:23:38","modified_gmt":"2026-10-02T05:23:38","slug":"common-denominator","status":"publish","type":"drill","link":"https:\/\/www.risu-japan.com\/drill\/grade5\/reduce-common-denominator\/common-denominator\/","title":{"rendered":"\u6700\u5c0f\u516c\u500d\u6570\u3092\u4f7f\u3063\u305f\u901a\u5206\u306e\u30b3\u30c4"},"content":{"rendered":"<p><!-- body-start --><\/p>\n<h2>\u6700\u5c0f\u516c\u500d\u6570\u3092 \u4f7f\u3063\u305f \u901a\u5206\u3068\u306f<\/h2>\n<p>\u5206\u6bcd\u304c\u3061\u304c\u3046\u5206\u6570\u3092\u3001\u5927\u304d\u3055\u3092\u5909\u3048\u305a\u306b\u540c\u3058\u5206\u6bcd\u306e\u5206\u6570\u306b\u305d\u308d\u3048\u308b\u3053\u3068\u3092\u300c\u901a\u5206\uff08\u3064\u3046\u3076\u3093\uff09\u300d\u3068\u8a00\u3044\u307e\u3059\u3002\u901a\u5206\u3092\u3059\u308b\u3068\u3001\u5206\u6570\u306e\u5927\u304d\u3055\u3092\u6bd4\u3079\u305f\u308a\u3001\u305f\u3057\u7b97\u3084\u3072\u304d\u7b97\u3092\u3057\u305f\u308a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5206\u6bcd\u540c\u58eb\u3092\u304b\u3051\u7b97\u3057\u3066\u305d\u308d\u3048\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u6570\u304c\u5927\u304d\u304f\u306a\u3063\u3066\u8a08\u7b97\u304c\u5927\u5909\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3053\u3067\u30012\u3064\u306e\u5206\u6bcd\u306e\u300c\u6700\u5c0f\u516c\u500d\u6570\u300d\u3092\u901a\u5206\u3059\u308b\u6570\u306b\u9078\u3076\u3068\u3001\u4e00\u756a\u5c0f\u3055\u306a\u6570\u3067\u5206\u6bcd\u3092\u305d\u308d\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u305d\u306e\u5f8c\u306e\u8a08\u7b97\u304c\u3068\u3066\u3082\u697d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u8a08\u7b97\u306e \u30eb\u30fc\u30eb<\/h2>\n<h3>1. \u6700\u5c0f\u516c\u500d\u6570\u3092\u898b\u3064\u3051\u308b<\/h3>\n<p>2\u3064\u306e\u5206\u6570\u306e\u5206\u6bcd\u306e\u300c\u6700\u5c0f\u516c\u500d\u6570\u300d\u3092\u898b\u3064\u3051\u307e\u3059\u3002<\/p>\n<h3>2. \u5206\u6bcd\u306b\u304b\u3051\u308b\u6570\u3092\u8003\u3048\u308b<\/h3>\n<p>\u65b0\u3057\u3044\u5206\u6bcd\u304c\u305d\u306e\u300c\u6700\u5c0f\u516c\u500d\u6570\u300d\u306b\u306a\u308b\u3088\u3046\u306b\u3001\u3082\u3068\u306e\u5206\u6bcd\u306b\u4f55\u3092\u304b\u3051\u308c\u3070\u3088\u3044\u304b\u8003\u3048\u307e\u3059\u3002<\/p>\n<h3>3. \u5206\u5b50\u306b\u3082\u540c\u3058\u6570\u3092\u304b\u3051\u308b<\/h3>\n<p>\u5206\u6bcd\u306b\u304b\u3051\u305f\u6570\u3068\u300c\u540c\u3058\u6570\u300d\u3092\u3001\u5206\u5b50\u306b\u3082\u304b\u3051\u307e\u3059\uff08\u5206\u6bcd\u3068\u5206\u5b50\u306b\u540c\u3058\u6570\u3092\u304b\u3051\u3066\u3082\u5206\u6570\u306e\u5927\u304d\u3055\u306f\u5909\u308f\u308a\u307e\u305b\u3093\uff09\u3002<\/p>\n<p><!-- \u4f8b\u984c --><\/p>\n<section class=\"example-section\">\n<h2 class=\"example-section__heading\">\u4f8b\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>2<\/mn><\/mrow><mrow><mn>3<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3092 \u901a\u5206\u3057\u307e\u3057\u3087\u3046\u3002\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u306e \u6700\u5c0f\u516c\u500d\u6570\u3092 \u898b\u3064\u3051\u3066 \u901a\u5206\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>6<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>8<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3092 \u901a\u5206\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"explanation-block\">\n<h3 class=\"explanation-block__heading\">\u89e3\u8aac<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>12<\/mn><\/math><\/span> \u3067\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>2<\/mn><\/mrow><mrow><mn>3<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>8<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>8<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>6<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>8<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><\/math><\/span> \u3067\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>6<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>20<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>8<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>20<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u7df4\u7fd2\u554f\u984c --><\/p>\n<section class=\"practice-problems\">\n<h2>\u7df4\u7fd2\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>\u6b21\u306e 2\u3064\u306e \u5206\u6570\u3092 \u901a\u5206\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><mo>,<\/mo><mfrac><mrow><mn>4<\/mn><\/mrow><mrow><mn>5<\/mn><\/mrow><\/mfrac><\/math><\/div>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>\u6b21\u306e 2\u3064\u306e \u5206\u6570\u3092 \u901a\u5206\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>6<\/mn><\/mrow><\/mfrac><mo>,<\/mo><mfrac><mrow><mn>7<\/mn><\/mrow><mrow><mn>18<\/mn><\/mrow><\/mfrac><\/math><\/div>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>8<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3092 \u901a\u5206\u3057\u3066\u3001\u3069\u3061\u3089\u304c \u5927\u304d\u3044\u304b \u7b54\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- \u5fdc\u7528\u554f\u984c --><\/p>\n<section class=\"advanced-problems\">\n<h2>\u5fdc\u7528\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>1<\/mn><\/mrow><mrow><mn>2<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>2<\/mn><\/mrow><mrow><mn>3<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306e\u300c3\u3064\u306e \u5206\u6570\u300d\u3092 \u4e00\u5ea6\u306b \u901a\u5206\u3057\u3066\u3001\u5206\u6bcd\u3092 \u540c\u3058 \u6570\u306b \u305d\u308d\u3048\u307e\u3057\u3087\u3046\u3002\uff08\u30d2\u30f3\u30c8\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2<\/mn><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u306e 3\u3064\u306e \u6570\u306e \u6700\u5c0f\u516c\u500d\u6570\u3092 \u898b\u3064\u3051\u307e\u3059\uff09<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>A\u306e \u3073\u3093\u306b\u306f \u5168\u4f53\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001B\u306e \u3073\u3093\u306b\u306f \u5168\u4f53\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>4<\/mn><\/mrow><mrow><mn>5<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306e \u30b8\u30e5\u30fc\u30b9\u304c \u5165\u3063\u3066 \u3044\u307e\u3059\u3002\u3069\u3061\u3089\u306e \u3073\u3093\u306b \u3088\u308a \u591a\u304f\u306e \u30b8\u30e5\u30fc\u30b9\u304c \u5165\u3063\u3066 \u3044\u307e\u3059\u304b\u3002\u901a\u5206\u3057\u3066 \u7406\u7531\u3092 \u8aac\u660e\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p>\u306f\u306a\u3053\u3055\u3093\u306f\u3001\u3042\u308b 2\u3064\u306e \u5206\u6570\u3092 \u901a\u5206\u3057\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>40<\/mn><\/mrow><mrow><mn>48<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>18<\/mn><\/mrow><mrow><mn>48<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b \u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f \u9593\u9055\u3044\u3067\u306f \u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3082\u3063\u3068 \u5c0f\u3055\u306a \u5206\u6bcd\u3067 \u901a\u5206\u3059\u308b \u3053\u3068\u304c \u3067\u304d\u307e\u3057\u305f\u3002\u5206\u6bcd\u3092 \u3044\u304f\u3064\u306b \u3059\u308c\u3070 \u3088\u304b\u3063\u305f\u3067\u3059\u304b\u3002\u307e\u305f\u3001\u305d\u306e \u3068\u304d\u306e 2\u3064\u306e \u5206\u6570\u3092 \u7b54\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- \u89e3\u7b54\u3068\u89e3\u8aac --><\/p>\n<section class=\"answer-section\">\n<h2>\u89e3\u7b54\u3068\u89e3\u8aac<\/h2>\n<div class=\"answer-group answer-group--practice\">\n<h3>\u7df4\u7fd2\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>5<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>20<\/mn><\/math><\/span> \u3067\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>5<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>4<\/mn><\/mrow><mrow><mn>5<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>16<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>16<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>6<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>18<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>18<\/mn><\/math><\/span> \u3067\u3059\u3002<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>6<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u5206\u6bcd\u3068\u5206\u5b50\u306b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span> \u3092\u304b\u3051\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>18<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>7<\/mn><\/mrow><mrow><mn>18<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u305d\u306e\u307e\u307e\u3067\u305d\u308d\u3044\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>18<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>7<\/mn><\/mrow><mrow><mn>18<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f3<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>8<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>12<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><\/math><\/span> \u306a\u306e\u3067\u3001\u901a\u5206\u3059\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>8<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>10<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002\u5206\u5b50\u3092\u6bd4\u3079\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>10<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span>\uff08<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\uff09\u306e\u65b9\u304c\u5927\u304d\u3044\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>5<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306e\u307b\u3046\u304c\u5927\u304d\u3044<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"answer-group answer-group--advanced\">\n<h3>\u5fdc\u7528\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2<\/mn><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>3<\/mn><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>12<\/mn><\/math><\/span> \u3067\u3059\u3002\u305d\u308c\u305e\u308c\u901a\u5206\u3059\u308b\u3068\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>1<\/mn><\/mrow><mrow><mn>2<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>6<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>2<\/mn><\/mrow><mrow><mn>3<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>8<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>3<\/mn><\/mrow><mrow><mn>4<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>6<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>8<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>12<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u5206\u6bcd\u306e <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>5<\/mn><\/math><\/span> \u306e\u6700\u5c0f\u516c\u500d\u6570\u3067\u3042\u308b <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>20<\/mn><\/math><\/span> \u3067\u901a\u5206\u3059\u308b\u3068\u3001A\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001B\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>16<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u306a\u308a\u307e\u3059\u3002\u5206\u5b50\u3092\u6bd4\u3079\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>16<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span>\uff08B\u306e\u3073\u3093\uff09\u306e\u65b9\u304c\u591a\u3044\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1aB\u306e\u3073\u3093\uff08\u7406\u7531\u306e\u4f8b\uff1a\u901a\u5206\u3059\u308b\u3068A\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>15<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span>\u3001B\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>16<\/mn><\/mrow><mrow><mn>20<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068\u306a\u308a\u3001B\u306e\u307b\u3046\u304c\u591a\u3044\u305f\u3081\uff09<\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f3<\/h4>\n<p><span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>40<\/mn><\/mrow><mrow><mn>48<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>18<\/mn><\/mrow><mrow><mn>48<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306f\u3001\u3069\u3061\u3089\u3082\u5206\u5b50\u3068\u5206\u6bcd\u3092 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>2<\/mn><\/math><\/span> \u3067\u5272\u308b\u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>20<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u306b\u7d04\u5206\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u4ee5\u4e0a\u5c0f\u3055\u304f\u901a\u5206\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u5206\u6bcd\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><\/math><\/span> \u306b\u3059\u308c\u3070\u3088\u304b\u3063\u305f\u3068\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u5206\u6bcd <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><\/math><\/span>\u30012\u3064\u306e\u5206\u6570\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>20<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span> \u3068 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mfrac><mrow><mn>9<\/mn><\/mrow><mrow><mn>24<\/mn><\/mrow><\/mfrac><\/math><\/span><\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9 --><\/p>\n<aside class=\"advice-box\">\n<h2 class=\"advice-box__heading\">\u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9<\/h2>\n<div 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